AUTONAUTIC INSTRUMENTAL C20 Manuel d'installation et d'utilisation - Page 5

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3. MAINTENANCE

Compass Bowl

The compass bowl should be regularly inspected to ensure that there are no leaks or

bubbles. In addition, the upper and lower glass should be maintained in a clean

condition, and the compass gimballing checked.

A few times per year, and more regularly on vessels with high vibration levels or

following heavy weather, an operational test should be carried out on the magnetic

compass to ensure that no friction has developed on the pivot and jewel. This

operational test should be carried out as follows:‐

Whilst the vessel is alongside, bring a magnetic object towards the compass so that the

heading is deviated by 2 degrees. Hold the deviated compass card in this position for

10 seconds, and then release by removing the magnetic object. When the compass

card settles it should be within 15 seconds of arc of the original heading. If the

compass card does not return within this limit then there is a high level of friction

between the pivot and jewel. The compass should be overhauled by a competent

authority.

Binnacle

The C20 Binnacle has one of the simplest periscope arrangements, utilising only

one lens and mirror. The lens is easily removed for cleaning at periodic intervals from

the foreward side of the binnacle.

The only area where maintenance may be required is with the binnacle lighting. There

are two LED lamps within the binnacle, and an additional spare, all accessible by

removing the binnacle.